Mac mid-lengths header install
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iTrader: (17)
Joined: Nov 2004
Posts: 1,639
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From: Near Philly,PA
Mac mid-lengths header install Ok, the time is near.
Give me a list for everything I might need/want for this header install.
Mac midlengths w/EGR and AIR tubes. ORY pipe
I read that I might not need O2 extensions with these?
Use stock GM gaskets? Copper gaskets? Do I need a gasket for where the ypipe and headers meet? Use stock bolts?
I'm going to delete the rear O2's...what do I do with the connectors? Do I have my tuning guy delete them first or wait until the headers are on? If I wait will the car suffer performance wise until I get it retuned?
Just trying to get an idea on everything I need. Thanks!
Give me a list for everything I might need/want for this header install.
Mac midlengths w/EGR and AIR tubes. ORY pipe
I read that I might not need O2 extensions with these?
Use stock GM gaskets? Copper gaskets? Do I need a gasket for where the ypipe and headers meet? Use stock bolts?
I'm going to delete the rear O2's...what do I do with the connectors? Do I have my tuning guy delete them first or wait until the headers are on? If I wait will the car suffer performance wise until I get it retuned?
Just trying to get an idea on everything I need. Thanks!
Teching In
Joined: Oct 2004
Posts: 30
Likes: 0
From: VANDENBERG AFB, CA
Hey Frosty I just finished installing my mac headers and catted y pipe tonight.10 mm gear wrench is a must.the valve cover bolts are 8mm.As for gaskets I just reused my stock ones.My car has 47xxx on it.I did a search and found all the info I needed on the install.the passenger side bolt for the coil pack bracket is probably the hardest to get off.I went for a drive after and there is a very noticeable power difference.My car is an a4 and when I would punch it at 25mph before it didnt break the tires loose,now it does.good luck
Staging Lane
Joined: Jan 2004
Posts: 93
Likes: 0
From: Elmira, NY
You dont need a gasket where the header meets the y-pipe, they have ball flanges, I re-used my stock gaskets when I did my MAC install. I didnt need o2 extensions with the Macs, but I will tell you that MAC y-pipe sucks, just my opinion though. I tucked the up rear o2 wires up and covered them with electrical tape.
I put on Flowtech long tubes and they suck, after I do the merge collector mod on the MAC's they are going back on!
I put on Flowtech long tubes and they suck, after I do the merge collector mod on the MAC's they are going back on!
Originally Posted by superslowjoe
You dont need a gasket where the header meets the y-pipe, they have ball flanges, I re-used my stock gaskets when I did my MAC install. I didnt need o2 extensions with the Macs, but I will tell you that MAC y-pipe sucks, just my opinion though. I tucked the up rear o2 wires up and covered them with electrical tape.
I put on Flowtech long tubes and they suck, after I do the merge collector mod on the MAC's they are going back on!
I put on Flowtech long tubes and they suck, after I do the merge collector mod on the MAC's they are going back on!
Just curious..but what don't you like about the y-pipe? The merge collector? I'm about to make a header purchase myself...
